The DOI matches its Crossref record; 41 of the 41 references it cites were found in a registry or an index.
Thin Films of Sodium Birnessite-Type MnO2: Optical Properties, Electronic Band Structure, and Solar Photoelectrochemistry
Abstract
Inexpensive and earth-abundant, manganese oxides (Mn x O y ) have attracted considerable attention for catalysis, but fewer efforts have focused on their semiconducting properties. In this study, crystalline Na birnessite-type MnO 2 thin films were investigated for their surface and bulk chemistry in the context of hydrogen production by photoelectrochemical water splitting. Thin films were synthesized by electrodeposition onto fluorine-doped tin oxide (FTO) substrates, imaged by scanning electron microscopy (SEM), and characterized by X-ray diffraction (XRD) as well as X-ray photoelectron spectroscopy (XPS) and UV–vis spectroscopy. Three different electrochemical methods (illuminated open circuit potential, potential of photocurrent onset, and Mott–Schottky plots) were used to probe the flat-band potential required to construct a band diagram for the material. Photostability, conductivity, and band structure are discussed as potential causes of the low external quantum efficiency (<1%) for the birnessite-type MnO 2 photoanode. The position of the conduction band well below the hydrogen evolution potential likely mitigates this material’s potential use in a single absorber configuration, but its chemical, optical, and electronic characteristics as shown in this work may be well-suited for a photoanode in a tandem device.
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Metadata
- Authors
- Pinaud, B. A., Chen, Z., Abram, D. N., & Jaramillo, T. F.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-05-25
- Volume
- 115
- Issue
- 23
- Pages
- 11830-11838
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2316598438
- Cited by
- 294
- References
- 41
- FWCI
- 5.25
- Type
- journal article
- Language
- en
- Open access
- closed
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